The question I have is, how do these apps and websites know you are using a VPN, unless the VPN itself is telling them?

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They keep a list of all the IPs from the VPN provider. There's no solution for this besides getting a shit load of new fresh residential IPs.

Proton has a 'Stealth' protocol, but it doesn't work.

I wondered if that was the case. And I bet ISPs will be black-holed if they don’t divulge the information.